Doc,
Here's how I learned it lo, these many years ago (from the Small Catechism):
Q: What must we know and believe if after we have come to the use of reason we wish to be saved?
A: We must know and believe -- 1. That there is only one God; 2. That in God there are three Persons: the Father, the Son, and the Holy Ghost; 3. That God is supremely just, and that He rewards the good and punishes the wicked;
4. That the Son of God became man and redeemed us by His sufferings and death.
But Baptism is also required (also from the Small Catechism):
Q: Why can we not be saved without Baptism?
A: Because we are cleansed from original sin only by Baptism.
Hope this answered your question.
Regards,